20. A beam of electrons field of 10 N/ approximately A) 2 x 10 m/s is undeflecte

Question

20. A beam of electrons field of 10 N/ approximately A) 2 x 10 m/s is undeflected when it passes simultaneously through an electric ery both to its path and to the electric field. The speed of the electrons ia C perpendicular to its path and a magnetic field of 5 x 10 *T C) 5 x 10 m/s D) 2 x 10 m/s E) 5 x 10 m/'s A proton with a charge te is moving with a velocityvat 50° to the direction of a magnetic field B. The component of the resulting force on the proton in the direction 21. A) evB sin 50° cos 50 B) evB cos 50 C) zero D) evB sin 50 E) None of these is correct. 22. What is the magnetic field at the center of a circular loop with a diameter of 15.0 cm that carries a current of 1.50 A? A) zero 6.28 x 10-6 T B) C) 1.26 x 10-T D) 2.51 x 10-T E) 1.68 x 10T a uniform magnetic field of 0.55 T. What is the magnetic flux through this coil? A) 3.0 x 10- Wb B) 4.3 x 104 Wb C) 3.0 x 102 Wb D) 4.7 x 102 Wb E) 5.3 x 102 Wb 23. A 3.0-cm by 5.0-cm rectangular coil has 100 turns. Its axis makes an angle of 55° with

Explanation / Answer

20) speed of electron = E/B

speed of electron = 10/(5 *10^-4)

speed of electron =2 *10^4 m/s

option A) 2 *10^4 m/s

21)

as the force is given as

F = q* v X B

F = evB * sin(50)

option B)

22)

magnetic field = u0 *I/(2r)

magnetic field = 4pi *10^-7 * 1.5/(0.15)

magnetic field = 1.26 *10^-5 T

option C)

23)

magnetic flux = Area * N * B * cos(theta)

magnetic flux = 0.03 * 0.05 * 100 * cos(55) * 0.55

magnetic flux = 4.7 *10^-2 Wb

option D) 4.7 *10^-2 Wb

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